I could not see a driver for it so I went onto HP support website and downloaded the Synaptics driver (sp35444). The install got interrupted with the message "This Synaptics pointing device installation package does not support one or more of your pointing devices and will not be installed ".

I then tried the Alps driver (sp25796) and that installed (is visible in the Add/Remove Programs), but the touchpad still didn't work and it doesn't appear in either the Device Manager or in Control Panel->Mouse->Hardware tab.

Next I tried to install another version of the Synaptics driver (sp27681). This one installed so I then rebooted the laptop.

The touchpad still doesn't work, but now I have the Synaptics Device Settings tab in my Mouse settings. The problem is that all the buttons are grayed out and no devices are listed.

Is it possible that this is a hardware fault or is there anything else I need to download?